Update README.md

Author: evelyne-ringoot

README.md

@@ -53,8 +53,9 @@ By the end of the course students will be able to use Julia to write write porta
 | 7 |  M |   4/14   | Kimmerer, Edelman      | Perlmutter, GPU pictures |    |
 | 8 | W | 4/16 | Alomairy | GPU background |[colab link](https://colab.research.google.com/drive/1d5DhDmU6-0YpmB6MNCoc_TlzTxwQs8Uw?usp=sharing) [gpu slides](https://docs.google.com/presentation/d/1GG7PMXWD4A5citjWOnRm881pS5NtCyRc/edit#slide=id.p1)
 | 9 | F | 4/18 | Alomairy, Ringoot| GPU software | [Slides](https://docs.google.com/presentation/d/1GMYKndXzzzzYwu6LUqe0Ga6wPnd9R72w/edit#slide=id.p2) | |
+|    |       |          |                            |  **Week 4 - GPU Computing**| 
 | 10 | W | 4/23 | Alomairy | GPU Acceleration |  [Slides](https://docs.google.com/presentation/d/1GqkKC3f7f1dcg-X1wcxQd-KYEoQgD-lP/edit#slide=id.p1)| |
-|    |       |          |                            |  **Week 4 - GPU Computing**|    
+| 11 | F | 4/25 | Ringoot | GPU Acceleration |  [Slides](https://docs.google.com/presentation/d/1zqjzfpyOJOEiCR6sjz39_AlcaBZvccbV/edit?usp=sharing&ouid=111707541660722014594&rtpof=true&sd=true)| |
 |    |       |          |                            |  **Week 5 - GPU Computing**|    
 |    |       |          |                            |  **Week 6 - Distributed Computing (MPI + Dagger.jl)**|    
 |    |       |          |                            |  **Week 7 - Parallelism Concepts and Julia Performance**|